CN203491665U - Automatic reset overvoltage/undervoltage protection circuit - Google Patents
Automatic reset overvoltage/undervoltage protection circuit Download PDFInfo
- Publication number
- CN203491665U CN203491665U CN201320504195.4U CN201320504195U CN203491665U CN 203491665 U CN203491665 U CN 203491665U CN 201320504195 U CN201320504195 U CN 201320504195U CN 203491665 U CN203491665 U CN 203491665U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- overvoltage
- comparator
- under
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005070 sampling Methods 0.000 claims abstract description 21
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 12
- 230000000052 comparative effect Effects 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses an automatic reset overvoltage/undervoltage protection circuit. The automatic reset overvoltage/undervoltage protection circuit comprises an internal power supply circuit, an external power supply sampling circuit, an overvoltage reference circuit, an overvoltage comparator circuit, an undervoltage reference circuit, an undervoltage comparator circuit and a relay control circuit. The overvoltage comparator circuit compares an overvoltage reference voltage generated by the overvoltage reference circuit with a sampling voltage obtained by the external power supply sampling circuit to determine whether an overvoltage phenomenon occurs, in the same way, the undervoltage comparator circuit compares an undervoltage reference voltage generated by the undervoltage reference circuit with the sampling voltage obtained by the external power supply sampling circuit to determine whether an undervoltage phenomenon occurs, and the relay control circuit controls the on-off of a main circuit in accordance with whether the overvoltage or undervoltage phenomenon occurs. The automatic reset overvoltage/undervoltage protection circuit of the utility model can cut off the main circuit when an external power supply is in an overvoltage or undervoltage state to protect the power equipment, and can recover the connection of the main circuit automatically after the external power supply returns to normal.
Description
Technical field
The utility model relates to low-voltage circuit technical field, particularly relates to a kind of over under-voltage protection circuit that automatically resets.
Background technology
All kinds of power consumption equipments have different rated voltages and the scope range of the fluctuation of voltage of permission, and electric equipment will be worked and is only best state under rated voltage.
But in our daily life, run into sometimes high pressure or low pressure phenomenon, voltage exceeds rated voltage and is called overvoltage, is called under-voltage lower than rated voltage.
And overvoltage and the under-voltage harm that power consumption equipment is caused are mainly manifested in device to damage because of the scope that the voltage that bears and current stress exceed normal use, because electricity function index is destroyed, can not meet the demands simultaneously.Many electronic instruments or home appliance, may be burnt while moving the in the situation that of high pressure, and can affect useful life while under low pressure working.
Utility model content
For solving the problems of the technologies described above, the utility model provides a kind of over under-voltage protection circuit that automatically resets, to overcome in prior art due to overvoltage or the under-voltage defect that causes power consumption equipment to damage.
For achieving the above object, the utility model provides a kind of over under-voltage protection circuit that automatically resets, and described circuit comprises interior power supply circuit, external power source sample circuit, overvoltage reference circuit, overvoltage comparator circuit, under-voltage reference circuit, under-voltage comparator circuit and control relay circuit;
It is the operating voltage of relay and comparator by the voltage transitions of external power source that described interior power supply circuit is used for;
Described external power source sample circuit is used for external voltage to sample, and sampling voltage is sent to described overvoltage comparator circuit and under-voltage comparator circuit;
Described overvoltage reference circuit is used for obtaining overvoltage reference voltage;
Described overvoltage comparator circuit is used for described sampling voltage and overvoltage reference voltage to compare, and comparative result is sent to described control relay circuit;
Described under-voltage reference circuit is used for obtaining under-voltage reference voltage;
Described under-voltage comparator circuit is used for described sampling voltage and under-voltage reference voltage to compare, and comparative result is sent to described control relay circuit;
Described control relay circuit, for according to the comparative result of described overvoltage comparator circuit and under-voltage comparator circuit, is controlled the break-make of main circuit.
Wherein, described interior power supply circuit comprises relay power circuit and comparator power circuit; The input of described relay power circuit connects external power source, and external power source is carried out after step-down rectifier, obtains for the first direct voltage to relay power supply; The input of described comparator power circuit connects the output of described relay power circuit, and described the first direct voltage is carried out after current limliting, filtering, voltage stabilizing, obtains for the second direct voltage to comparator power supply.
Wherein, the input of described overvoltage reference circuit connects the output of described comparator power circuit, and described the second direct voltage is carried out, after current limliting, voltage stabilizing, obtaining overvoltage reference voltage.
Wherein, the input of described under-voltage reference circuit connects the output of described overvoltage reference circuit, and described overvoltage reference voltage is carried out, after dividing potential drop, obtaining under-voltage reference voltage.
Wherein, the input of described external power source sample circuit connects external power source, and external power source is carried out, after step-down, rectification, current limliting, filtering, obtaining external power source sampling voltage.
Wherein, described control relay circuit comprises the first triode, controls comparator and the second triode; The base input end of described the first triode connects the output of described overvoltage comparator circuit and under-voltage comparator circuit, grounded emitter, and collector output connects the electrode input end of described control comparator; The negative input of described control comparator connects the output of described overvoltage reference circuit; The base input end of described the second triode connects the output of described control comparator, grounded emitter, after the coil of collector electrode series relay, be connected with the output of described relay power circuit, according to the open and close of relay described in the signal controlling of base stage; The corresponding contacts of described relay connects main circuit, controls the break-make of main circuit.
Wherein, also comprise indicating circuit, described indicating circuit comprises work Light-Emitting Diode, overvoltage Light-Emitting Diode and under-voltage Light-Emitting Diode; The positive pole of described work Light-Emitting Diode connects the collector electrode of described the second triode, minus earth; The positive pole of described overvoltage Light-Emitting Diode connects the output of described overvoltage comparator circuit, and negative pole connects the input of described control relay circuit; The positive pole of described under-voltage Light-Emitting Diode connects the output of described under-voltage comparator circuit, and negative pole connects the input of described control relay circuit.
Compared with prior art, the utlity model has following beneficial effect:
The over under-voltage protection circuit that automatically resets of the present utility model, externally power supply generation overvoltage or under-voltage time, disconnects main circuit, and power consumption equipment is protected; And, externally power up normal after, the connection that automatically recovers main circuit.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of a kind of over under-voltage protection circuit that automatically resets of the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but are not used for limiting scope of the present utility model.
As shown in Figure 1, described circuit comprises interior power supply circuit, external power source sample circuit, overvoltage reference circuit, overvoltage comparator circuit, under-voltage reference circuit, under-voltage comparator circuit and control relay circuit to the circuit theory diagrams of a kind of over under-voltage protection circuit that automatically resets of the utility model embodiment; It is the operating voltage of relay and comparator by the voltage transitions of external power source that described interior power supply circuit is used for; Described external power source sample circuit is used for external voltage to sample, and sampling voltage is sent to described overvoltage comparator circuit and under-voltage comparator circuit; Described overvoltage reference circuit is used for obtaining overvoltage reference voltage; Described overvoltage comparator circuit is used for described sampling voltage and overvoltage reference voltage to compare, and comparative result is sent to described control relay circuit; Described under-voltage reference circuit is used for obtaining under-voltage reference voltage; Described under-voltage comparator circuit is used for described sampling voltage and under-voltage reference voltage to compare, and comparative result is sent to described control relay circuit; Described control relay circuit, for according to the comparative result of described overvoltage comparator circuit and under-voltage comparator circuit, is controlled the break-make of main circuit.
Described interior power supply circuit comprises relay power circuit and comparator power circuit.The input of described relay power circuit connects external power source, and external power source is carried out after step-down rectifier, obtains for the first direct voltage to relay K A1A power supply.In the present embodiment, described relay power circuit specifically comprises the capacitance-resistance voltage reduction circuit that capacitor C 1 and resistance R 1 form, the rectification circuit that D1-D4 forms, and filter capacitor C2, and the first direct voltage forming at C2 two ends in the present embodiment is 24V.
The input of described comparator power circuit connects the output of described relay power circuit, described the first direct voltage is carried out after current limliting, filtering, voltage stabilizing, obtain for the second direct voltage to comparator (comprise overvoltage comparator IC2, under-voltage comparator IC1 and control comparator IC3) power supply.In the present embodiment, described comparator power circuit specifically comprises current-limiting resistance R5, filter capacitor C4 and voltage stabilizing didoe DW1, and the second direct voltage forming at DW1 two ends in the present embodiment is 12V.
The input of described overvoltage reference circuit connects the output of described comparator power circuit, and described the second direct voltage is carried out, after current limliting, voltage stabilizing, obtaining overvoltage reference voltage.In the present embodiment, described overvoltage reference circuit specifically comprises current-limiting resistance R6 and voltage stabilizing didoe DW2, and the overvoltage reference voltage forming at DW2 two ends in the present embodiment is 6V, and this overvoltage reference voltage is applied to the negative input of overvoltage comparator IC2.
The input of described under-voltage reference circuit connects the output of described overvoltage reference circuit, and described overvoltage reference voltage is carried out, after dividing potential drop, obtaining under-voltage reference voltage.In the present embodiment, described under-voltage reference circuit specifically comprises divider resistance R8 and R9, and the under-voltage reference voltage forming at R9 two ends in the present embodiment is 4V, the electrode input end of this is under-voltage reference voltage is applied to under-voltage comparator IC1.
The input of described external power source sample circuit connects external power source, and external power source is carried out, after step-down, rectification, current limliting, filtering, obtaining external power source sampling voltage.In the present embodiment, described external power source sample circuit specifically comprises dropping resistor R2, rectifier diode D5, current-limiting resistance R3 and rc filter circuit R4, C3.The present embodiment peripheral power supply sampling voltage is applied to the electrode input end of overvoltage comparator IC2 and the negative input of under-voltage comparator IC1.
Described control relay circuit comprises the first triode VT1, controls comparator IC3 and the second triode VT2; The base input end of described the first triode VT1 connects the output of described overvoltage comparator circuit and under-voltage comparator circuit, grounded emitter, and collector output connects the electrode input end of described control comparator IC3; The negative input of described control comparator IC3 connects the output of described overvoltage reference circuit; The base input end of described the second triode VT2 connects the output of described control comparator IC3, grounded emitter, after the coil of collector electrode series relay KA1A, be connected with the output of described relay power circuit, according to the open and close of relay K A1A described in the signal controlling of base stage; The corresponding contacts KA1B of described relay K A1A connects main circuit, controls the break-make of main circuit.
The described over under-voltage protection circuit that automatically resets also comprises indicating circuit, and described indicating circuit comprises work Light-Emitting Diode LED1, overvoltage Light-Emitting Diode LED3 and under-voltage Light-Emitting Diode LED2; The positive pole of described work Light-Emitting Diode LED1 connects the collector electrode of described the second triode VT2, minus earth; The positive pole of described overvoltage Light-Emitting Diode LED3 connects the output of described overvoltage comparator circuit, and negative pole connects the input of described control relay circuit; The positive pole of described under-voltage Light-Emitting Diode LED2 connects the output of described under-voltage comparator circuit, and negative pole connects the input of described control relay circuit.
Below the course of work of the over under-voltage protection circuit that automatically resets of the present embodiment is described as follows:
1. power supply normal condition: when the L of external power source and N input AC220V, after the step-down rectifier by C1 and R1 and D1-D4, form DC24 voltage at C2 two ends, KA1A working power is provided; After current limliting by R5 and C4, DW1, filtering, voltage stabilizing, provide LM324 working power; After current limliting by R6 and DW2, voltage stabilizing, provide IC2 overvoltage voltage comparator 6V overvoltage reference power supply; After dividing potential drop step-down by R8 and R9, provide IC1 under voltage voltage comparator 4V under voltage reference power supply.After rectification by R2, D5, R3, R4, C3, step-down, current limliting, filtering, give respectively IC2 overvoltage voltage comparator and IC1 under voltage voltage comparator sampling voltage, if supply voltage normal (between 175V-275V), two equal output low levels of voltage comparator.LED2 and LED3 are cut-off state, IC3 output low level, and VT2 cut-off, LED1 lights, and KA1A work, connects main circuit.
2. power supply under-voltage state: when the L of external power source and N input are during lower than AC175V, after the step-down rectifier by C1 and R1 and D1-D4, form DC24 voltage at C2 two ends, KA1A working power is provided; After current limliting by R5 and C4, DW1, filtering, voltage stabilizing, provide LM324 working power; After current limliting by R6 and DW2, voltage stabilizing, provide IC1A overvoltage voltage comparator 6V overvoltage reference power supply; After dividing potential drop step-down by R8 and R9, provide IC1D under voltage voltage comparator 4V under voltage reference power supply.By rectification, the step-down of R2, D5, R3, R4, C3, current limliting, gives respectively IC2 overvoltage voltage comparator and IC1 under voltage voltage comparator sampling voltage after filtering.Supply voltage is during lower than AC175V, IC1 under voltage voltage comparator output high level, and LED2 lights, VT2 conducting, LED1 cut-off, KA1A does not work, and cuts off main circuit.After L and N input recovery normally, two equal output low levels of voltage comparator, LED2 and LED3 are cut-off state, IC3 output low level, VT2 cut-off, LED1 lights, KA1A work, the connection that recovers main circuit.
3. overvoltage of power supply state: when the L of external power source and N input are during higher than AC275V, after the step-down rectifier by C1 and R1 and D1-D4, form DC24 voltage at C2 two ends, KA1A working power is provided; After current limliting by R5 and C4, DW1, filtering, voltage stabilizing, provide LM324 working power; After current limliting by R6 and DW2, voltage stabilizing, provide IC2 overvoltage voltage comparator 6V overvoltage reference power supply; After dividing potential drop step-down by R8 and R9, provide IC1 under voltage voltage comparator 4V under voltage reference power supply.By rectification, the step-down of R2, D5, R3, R4, C3, current limliting, after filtering, give respectively IC2 overvoltage voltage comparator and IC1 under voltage voltage comparator sampling voltage, supply voltage is during higher than AC275V, IC2 overvoltage voltage comparator output high level, and LED3 lights, VT2 conducting, LED1 cut-off, KA1A does not work, and cuts off main circuit.After L and N input recovery normally, two equal output low levels of voltage comparator, LED2 and LED3 are cut-off state, IC3 output low level, VT2 cut-off, LED1 lights, KA1A work, the connection that recovers main circuit.
The over under-voltage protection circuit that automatically resets of the present utility model, externally power supply generation overvoltage or under-voltage time, disconnects main circuit, and power consumption equipment is protected; And, externally power up normal after, the connection that automatically recovers main circuit.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvement and replacement, these improvement and replacement also should be considered as protection range of the present utility model.
Claims (7)
1. the over under-voltage protection circuit that automatically resets, it is characterized in that, described circuit comprises interior power supply circuit, external power source sample circuit, overvoltage reference circuit, overvoltage comparator circuit, under-voltage reference circuit, under-voltage comparator circuit and control relay circuit;
It is the operating voltage of relay and comparator by the voltage transitions of external power source that described interior power supply circuit is used for;
Described external power source sample circuit is used for external voltage to sample, and sampling voltage is sent to described overvoltage comparator circuit and under-voltage comparator circuit;
Described overvoltage reference circuit is used for obtaining overvoltage reference voltage;
Described overvoltage comparator circuit is used for described sampling voltage and overvoltage reference voltage to compare, and comparative result is sent to described control relay circuit;
Described under-voltage reference circuit is used for obtaining under-voltage reference voltage;
Described under-voltage comparator circuit is used for described sampling voltage and under-voltage reference voltage to compare, and comparative result is sent to described control relay circuit;
Described control relay circuit, for according to the comparative result of described overvoltage comparator circuit and under-voltage comparator circuit, is controlled the break-make of main circuit.
2. the over under-voltage protection circuit that automatically resets according to claim 1, is characterized in that, described interior power supply circuit comprises relay power circuit and comparator power circuit; The input of described relay power circuit connects external power source, and external power source is carried out after step-down rectifier, obtains for the first direct voltage to relay power supply; The input of described comparator power circuit connects the output of described relay power circuit, and described the first direct voltage is carried out after current limliting, filtering, voltage stabilizing, obtains for the second direct voltage to comparator power supply.
3. the over under-voltage protection circuit that automatically resets according to claim 2; it is characterized in that; the input of described overvoltage reference circuit connects the output of described comparator power circuit, and described the second direct voltage is carried out, after current limliting, voltage stabilizing, obtaining overvoltage reference voltage.
4. the over under-voltage protection circuit that automatically resets according to claim 3, is characterized in that, the input of described under-voltage reference circuit connects the output of described overvoltage reference circuit, and described overvoltage reference voltage is carried out, after dividing potential drop, obtaining under-voltage reference voltage.
5. according to the over under-voltage protection circuit that automatically resets described in claim 2 to 4 any one; it is characterized in that; the input of described external power source sample circuit connects external power source, and external power source is carried out, after step-down, rectification, current limliting, filtering, obtaining external power source sampling voltage.
6. the over under-voltage protection circuit that automatically resets according to claim 5, is characterized in that, described control relay circuit comprises the first triode, controls comparator and the second triode; The base input end of described the first triode connects the output of described overvoltage comparator circuit and under-voltage comparator circuit, grounded emitter, and collector output connects the electrode input end of described control comparator; The negative input of described control comparator connects the output of described overvoltage reference circuit; The base input end of described the second triode connects the output of described control comparator, grounded emitter, after the coil of collector electrode series relay, be connected with the output of described relay power circuit, according to the open and close of relay described in the signal controlling of base stage; The corresponding contacts of described relay connects main circuit, controls the break-make of main circuit.
7. the over under-voltage protection circuit that automatically resets according to claim 6, is characterized in that, also comprises indicating circuit, and described indicating circuit comprises work Light-Emitting Diode, overvoltage Light-Emitting Diode and under-voltage Light-Emitting Diode; The positive pole of described work Light-Emitting Diode connects the collector electrode of described the second triode, minus earth; The positive pole of described overvoltage Light-Emitting Diode connects the output of described overvoltage comparator circuit, and negative pole connects the input of described control relay circuit; The positive pole of described under-voltage Light-Emitting Diode connects the output of described under-voltage comparator circuit, and negative pole connects the input of described control relay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320504195.4U CN203491665U (en) | 2013-08-13 | 2013-08-13 | Automatic reset overvoltage/undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320504195.4U CN203491665U (en) | 2013-08-13 | 2013-08-13 | Automatic reset overvoltage/undervoltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203491665U true CN203491665U (en) | 2014-03-19 |
Family
ID=50262467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320504195.4U Expired - Lifetime CN203491665U (en) | 2013-08-13 | 2013-08-13 | Automatic reset overvoltage/undervoltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203491665U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269816A (en) * | 2014-10-24 | 2015-01-07 | 长城电器集团有限公司 | Self-recovery overvoltage/undervoltage protector circuit |
| CN104682343A (en) * | 2014-12-08 | 2015-06-03 | 深圳市航盛电子股份有限公司 | Vehicle-mounted overvoltage and undervoltage protection circuit |
| CN107487185A (en) * | 2016-12-26 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric automobile |
| CN111211008A (en) * | 2020-01-14 | 2020-05-29 | 西安清泰科新能源技术有限责任公司 | Direct current relay with over-voltage and under-voltage protection |
| CN111969852A (en) * | 2020-07-07 | 2020-11-20 | 国电南瑞科技股份有限公司 | Circuit and method for switching power supply input voltage slow-drop undervoltage protection |
-
2013
- 2013-08-13 CN CN201320504195.4U patent/CN203491665U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269816A (en) * | 2014-10-24 | 2015-01-07 | 长城电器集团有限公司 | Self-recovery overvoltage/undervoltage protector circuit |
| CN104682343A (en) * | 2014-12-08 | 2015-06-03 | 深圳市航盛电子股份有限公司 | Vehicle-mounted overvoltage and undervoltage protection circuit |
| CN107487185A (en) * | 2016-12-26 | 2017-12-19 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric automobile |
| CN107487185B (en) * | 2016-12-26 | 2019-09-20 | 宝沃汽车（中国）有限公司 | Electric machine controller internal electric source over under-voltage protection circuit, method and electric car |
| CN111211008A (en) * | 2020-01-14 | 2020-05-29 | 西安清泰科新能源技术有限责任公司 | Direct current relay with over-voltage and under-voltage protection |
| CN111211008B (en) * | 2020-01-14 | 2022-09-27 | 西安清泰科新能源技术有限责任公司 | Direct current relay with over-voltage and under-voltage protection |
| CN111969852A (en) * | 2020-07-07 | 2020-11-20 | 国电南瑞科技股份有限公司 | Circuit and method for switching power supply input voltage slow-drop undervoltage protection |
| CN111969852B (en) * | 2020-07-07 | 2022-01-28 | 国电南瑞科技股份有限公司 | Circuit and method for switching power supply input voltage slow-drop undervoltage protection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203491665U (en) | Automatic reset overvoltage/undervoltage protection circuit | |
| CN205070392U (en) | Smart jack controller | |
| CN204350378U (en) | A kind of LED of energy extinguish fast | |
| CN203491680U (en) | Automatic reset electric leakage overvoltage/undervoltage protection circuit | |
| CN104391164A (en) | High-precision mains supply monitoring system | |
| CN109765982A (en) | A computer power circuit | |
| CN202906436U (en) | Overvoltage automatic power off protector | |
| CN103364688B (en) | Three-jack socket electric leakage detection circuit | |
| CN204720700U (en) | A kind of overload protection alarm socket | |
| CN103401215B (en) | A kind of over-and under-voltage protection circuit, protection socket and terminal | |
| CN203352465U (en) | DC stabilized power supply suitable for oil field and oil well remote measurement and control system | |
| CN205791483U (en) | There is the self-recovering type power supply changeover device of overvoltage, under-voltage protection | |
| CN204206137U (en) | A kind of protective circuit of refrigeration plant | |
| CN102394619B (en) | Household Automatic Power Switch with Power Limiting and Lightning Protection Functions | |
| CN202797875U (en) | Commercial power over-voltage and under-voltage automatic protector | |
| CN201278457Y (en) | Computer intelligent complete shut-down protector with over-voltage protection | |
| CN202373812U (en) | Energy-saving and consumption-reducing power socket | |
| CN204167866U (en) | The two-way out-of-limit detection protective circuit of line voltage | |
| CN205265229U (en) | Electrical load safety protection system | |
| CN205945007U (en) | Protection circuit of power supply circuit and power supply circuit | |
| CN206461343U (en) | Power protecting circuit | |
| CN104393563A (en) | Mains supply monitoring system | |
| CN204442187U (en) | A kind of safety low-pressure DC power supply | |
| CN204517363U (en) | Electrical network lightning protection over-voltage automatic power-off control device | |
| CN214100830U (en) | A portable overvoltage current limiting protector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201806 Shanghai Jiading District Waigang Industrial Park North Hui Ren Lu No. 1618 Patentee after: Shanghai Sankai Electrical Engineering Co.,Ltd. Address before: 201806 Shanghai Jiading District Waigang Industrial Park North Hui Ren Lu No. 1618 Patentee before: SHANGHAI SHSK ELECTRICAL Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210917 Address after: 201806 No. 1618, Huiren Road, Waigang Town, Jiading District, Shanghai Patentee after: Shanghai Sankai Electric Manufacturing Co.,Ltd. Address before: 201806 Shanghai Jiading District Waigang Industrial Park North Hui Ren Lu No. 1618 Patentee before: Shanghai Sankai Electrical Engineering Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140319 |